So I have both of these. The ps2 has a damaged laser, but everything else works fine. THe xbox has a few bits missing.
If you can fix the xbox, and add the extra parts, itll work. If you fix the laser on the ps2, itll work.
Otherwise, they'd make a neat case mod. The xbox has a psu, which I think could be modded fairly easy to accomodate a Mini ITX board.
I think you could prolly fit a small mobo in the ps2 case aswell.
Make me an offer, I really wanna get rid of these.